The taper-bored “QD” sprocket easily fits over the tapered hub and tightening of the cap screws produces a tight press fit on the shaft. The sprocket part is easily removed from the hub by using the pull-up bolts as jack screws in the holes tapped in the rim of the sprocket.

Zhijiang Sprocket factory has been making all kinds of Martin Catalog QD Bushing and sprockets for American customers more than 20years, material including steel C1045, SUS304, Casting.

4.With key on shaft, slide sprocket to desired position on shaft. Be sure heads of cap screws are on outside.

5.Align sprocket. Tighten screws alternately and progressively-until they are pulled up tight. To increase leverage, use wrench or length of pipe. Do not allow sprocket to be drawn in contact with flange of bushing; there should be a gap from 1/8” to 1/4”

Caution:

When mounting screws, apply pressure by hand only. If extreme tightening forces are applied, bursting pressures will be created in the sprocket hub. There should be a gap of 1/8” to 1/4” between the face of the sprocket hub and the flange of the QD bushing. The gap must not be closed. If the gap is closed under normal tightening, the shaft is seriously undersized.